Novel efficient cooling cylinder

The utility model provides a novel efficient cooling cylinder which comprises a water inlet pipe, a second-layer cover plate, a first-layer cover plate and a water return pipe, two paths of cooling water enter a water inlet end flange of the cylinder from the water inlet pipe, and enter four water pipe holes, located below the second-layer cover plate, of the water return end flange through six water pipe holes; cooling water flows back to the six water channel holes of the water inlet end flange and then flows back to the six holes, located in the second-layer cover plate, of the water return end flange through the six water channel holes, and due to sealing of the first-layer cover plate, the cooling water finally flows out of the two water pipes of the water return pipe; according to the novel efficient cooling cylinder, the cylinder is cooled through large-flow and short-stroke cooling water, so that a polymer is heated uniformly on the whole, the material characteristics are stable, the temperature contr